It is worth mentioning Hard Way still has a bunch of holes in it, like I got to the chapter on vectors and it is basically blank
I want a book to make production-ready software in Common Lisp, not to faff around. The Paul Graham "On Lisp" book seems excellent, and I'll dive into it next.
A direct link to the PDF is here too. https://github.com/ccceye/computer-book/blob/master/Practica...
Another interesting one is "Land of Lisp", https://www.amazon.com/Land-Lisp-Learn-Program-Game/dp/15932...
It's more theoretical, but kind of fun. It's a touch more academic (IMHO) than Practical Common Lisp, but pretty good.
Your recent efforts might be one of the reasons there is a little bit of Lisp hype on this forum lately :-)
It very much helps that there's a single standard that is quite rich (unlike Scheme) which makes for much easier portability between implementations, to the point that somewhat common repeated trope was developers using one implementation for faster iteration and another for deployment (for example, CCL for development and SBCL for faster code in deployment, or CCL/SBCL for development and ECL for target deployment).